CBCT测量不同骨面型患者下颌骨结构特征和磨牙后间隙的影响因素  

Structural characteristics of mandible in patients with different osteofacial types measured by CBCT and influencing factors of mandibular retromolar space

作　　者：孙芸芸 姚玉光 张晗 黎涵懿 朱宪春[1] SUN Yunyun;YAO Yuguang;ZHANG Han;LI Hanyi;ZHU Xianchun(Department of Orthodontics,Stomatology Hospital,Jilin University,Changchun 130021,China;Department of Stomatology,Hospital of Caofeidian District,Tangshan City,Hebei Province,Tangshan 063299,China)

机构地区：[1]吉林大学口腔医院正畸科,吉林长春130021 [2]河北省唐山市曹妃甸区医院口腔科,河北唐山063299

出　　处：《吉林大学学报（医学版）》2023年第6期1561-1568,共8页Journal of Jilin University：Medicine Edition

基　　金：吉林省科技厅科技发展计划项目(20210203064SF)。

摘　　要：目的:探讨不同骨面型患者磨牙后间隙的影响因素,分析下颌骨结构特征和磨牙后间隙与颅面部结构的相关性。方法:选取除第三磨牙外下颌牙列完整且拥挤量<5 mm的成年正畸患者200例,分为骨性Ⅰ类低角组、骨性Ⅰ类均角组、骨性Ⅰ类高角组、骨性Ⅱ类均角组和骨性Ⅲ类均角组。测量各组患者蝶窦A点角(SNA)、蝶窦B点角(SNB)、上下齿槽座角(ANB)、下颌平面角(SN-MP)、面高指数(FHI)、下颌升支长度(Go-Co)和下颌体长度(Go-Gn)。采用锥形束计算机断层扫描技术(CBCT)测量在水平面上与牙尖线平行的下颌[牙合]平面及其根方2 mm平面下颌第二磨牙至下颌升支前缘的最短距离C0和C2,釉牙骨质界根方2、4、6、8和10 mm平面的牙根至下颌骨舌侧内层骨皮质的最短距离R2、R4、R6、R8和R10,并采用Spearman相关分析法分析其相关性。结果:与骨性Ⅰ类低角组比较,骨性Ⅰ类均角组和骨性Ⅰ类高角组患者SN-MP均明显增大(P<0.01),FHI均明显减小(P<0.01)。与骨性Ⅰ类均角组比较,骨性Ⅰ类高角组患者SN-MP明显增大(P<0.01),FHI明显减小(P<0.01)。与骨性Ⅰ类均角组比较,骨性Ⅱ类均角组患者ANB明显增大(P<0.01),骨性Ⅲ类均角组患者ANB明显减小(P<0.01)。与骨性Ⅱ类均角组比较,骨性Ⅲ类均角组患者ANB明显减小(P<0.01)。在C2、R2、R4、R6、R8、R10平面下和Go-Co及Go-Gn中,与骨性Ⅰ类低角组比较,骨性Ⅰ类均角组和骨性Ⅰ类高角组患者下颌磨牙后间隙明显减小(P<0.01);与骨性Ⅰ类均角组比较,骨性Ⅰ类高角组患者下颌磨牙后间隙明显减小(P<0.01)。在C0平面下,与骨性Ⅰ类低角组和骨性Ⅰ类均角组比较,骨性Ⅰ类高角组患者下颌磨牙后间隙明显减小(P<0.01)。在C0、R2、R4、R6、R8和R10平面下,与骨性Ⅰ类均角组比较,骨性Ⅱ类均角组患者下颌磨牙后间隙明显减小(P<0.01),骨性Ⅲ类均角组患者下颌磨牙后间隙明显增大(P<0.01);与骨性ⅡObjective:To discuss the influence factors of retromolar space in the patients with different osteofacial types,and to analyze the correlation between the mandibular bone structure and retromolar space and craniofacial structure.Methods:A total of 200 adult orthodontic patients with fully erupted dentition except the third molars and crowding less than 5 mm were chosen and divided into skeletal typeⅠlow angle group,skeletal typeⅠaverage angle group,skeletal typeⅠhigh angle group,skeletal typeⅡaverage angle group,and skeletal typeⅢaverage angle group.The sella nasion A point angle(SNA),sella nasion B point angle(SNB),AB plane angle(ANB),skull base anterior-mandibular plane angle(SN-MP),facial height index(FHI),mandibular ramus length(Go-Co),and mandibular body length(Go-Gn)of all the patients were detected.Cone-beam computed tomography(CBCT)technology was used to detect the shortest distances C0 and C2 from the mandibular second molar to the anterior border of the ramus at the planes parallel to the cuspid line with a depth of 0 and 2 mm form the occlusal plane,and the shortest distances R2,R4,R6,R8,and R10 from the tooth root to the lingual cortical bone of the mandible at the enamel-bone junction in the root direction 2,4,6,8,and 10 mm planes.The correlation was analyzed by using Spearman correlation analysis.Results:Compared with skeletal typeⅠlow angle group,the SN-MP of the patients in skeletal typeⅠaverage angle group and skeletal typeⅠhigh angle group was increased significantly(P<0.01),and the FHI was decreased significantly(P<0.01).Compared with skeletal typeⅠaverage angle group,the SN-MP of the patients in skeletal type I high angle group was increased significantly(P<0.01),FHI was decreased significantly(P<0.01).Compared with skeletal typeⅠaverage angle group,the ANB of patients in skeletal typeⅡaverage angle group was significantly increased(P<0.01),while the ANB of the patients in skeletal typeⅢaverage angle group were significantly decreased(P<0.01).Compared with skeletal type

关 键 词：磨牙后间隙 磨牙远移 垂直骨面型 矢状骨面型 锥形束计算机断层扫描技术 

分 类 号：R783.5[医药卫生—口腔医学]